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3/4 VET HEALTH > 3 .Lymphatic system > Flashcards

3 .Lymphatic system Flashcards

1
Q

What is lymph

A

-A colourless fluid containing WBC
-drains through the lymphatic system into the bloodstream

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2
Q

Lymphatic system functions.

A

-collect excess tissue fluid from fluid around cells and return it to the cv system
-immune response
-absorbs fat (via lacteal) from the digestive system & transports it to the CV system

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3
Q

Function of lymph

A

Transports wastes & filters debris to & from the cv system.

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4
Q

What is Plasma

A

Fluid component of blood

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5
Q

Function of plasma

A

Transports nutrients & wastes via the blood around the body

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6
Q

What is tissue fluid

A

Fluid surrounding tissue that leaks out of the cardiovascular system due to increased pressure

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7
Q

Function of tissue fluid

A

-Supply cells with a stable environment
-provides nutrients such as oxygen for tissues.

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8
Q

Pathway of fluid starting at the cv system

A

Cv systems→leaks out→ collect tissue fluid →lymph capillaries → lymph vessels→ lymph nodes→ thoracic duct→cv system

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9
Q

Structure of lymph capillaries

A

-thin single epithelial cell wall
-overlapping epithelial cells→creates gaps
-interlaced with arterioles, venules, and capillary beds of the CV system
-closed at one end→end terminals

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10
Q

How does thin, single epithelial cell wall assist the lymph capillaries function

A

Tissue fluid can easily pass into the lymphatic system

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11
Q

How does overlapping epithelial cells assist in lymph capillaries function

A

Allows fluid to move IN to capillary but prevents back flow OUT of capllary

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12
Q

How does the interlacing with arterioles etc assist in the lymph capillaries function

A

Cv system can Easily access and collect excess fluid

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13
Q

Lymph vessels structure

A

Valves→prevent backflow
Larger then capillaries→carries lymph from capillaries to ducts

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14
Q

3 key lymphatic vessels

A

Large lymph vessels
Thoracic duct
Right lymphatic duct

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15
Q

Describe Large lymphatic vessels

A

Run along most major arteries and veins

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16
Q

Describe Thoracic duct

A

Drains lymph from both legs, abdominal, and pelvic cavities, the left half of the thorax, head, neck, and left arm

17
Q

Describe Right lymphatic duct

A

Drains lymph from the right half of the thorax, head, neck, and right arm

18
Q

What are primary lymphoid tissue

A

Sites where lymphocytes are formed and mature

19
Q

Examples of primary lymphoid tissue

A

Bone marrow
Thymus

20
Q

What is Secondary lymphoid tissue

A

Sites where lymphocytes interact and filter extra cellular fluid

21
Q

Examples of secondary lymphoid tissue

A

Lymph nodes
Spleen
Payers patches
Tonsil

22
Q

What does the thymus do

A

Mature T cells

23
Q

Bone marrow function

A

Create B and T lymphocytes
Mature B lymphocytes

24
Q

Which of the secondary lymphoid tissues Filter

A

Lymph nodes and spleen

25
Q

Which of the secondary lymphoid tissues DESTROY

A

Tonsils/ adenoids
Peyers patches

26
Q

What is structure of lymph nodes

A

-Small clustered lumps of specialised tissue along lymphatic vessels
-contain large amounts of lymphocytes, phagocytes and natural killer cells

27
Q

Lymph nodes function

A

-Filter lymph fluid as it is returning to the CV system
-remove foreign particles and break them down
-site of antigen presentation

28
Q

What are the MALT tissues

A

Tonsils
Peyers patches

29
Q

Structure of the spleen

A

Found in the left hypochondriac region
Consists of red and white pulp

30
Q

Functions of the spleen

A

Filters blood
Controls the levels of RBCs, WBCs and platelets in blood

31
Q

How does the spleen filter the blood

A

Removes viruses, bacteria and other foreign particles

32
Q

How does the spleen controls the levels of RBCs, WBCs and platelets

A

White pulp makes white blood cells
Red pulp removes old, damaged and dead RBCs

33
Q

Tonsils structure and function

A

Structure: Found in the mouth and back of throats
Function: destroy inhaled antigens/ pathogens

34
Q

Peyers patches structure and function

A

Structure: found in the small intestine
Function: destroy ingested/ swallowed antigens/pathogens

35
Q

How does lymph move

A

-valves that prevent back flow
-muscle pump by relaxation and contraction results in the ‘milking action’
-changes in thoracic pressure during respiration
-smooth muscle lining vessel walls contract

36
Q

What is lacteal and what’s its function

A

specialised lymphatic capillary on vili of small intestine
–>absorbs digested fats from small intestine

3/4 VET HEALTH (22 decks)

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